I was friended after browsing it to see what's going on. Here's my GUESS: it's an April Fools joke that logs your IP, and if they see you clicked at all, they friend you, and later will try to embarrass everyone who was curious enough to click.
That's just my guess, because I've learned that LJ humor isn't always my own brand of humor. But yeah, users don't have the power to stop someone from friending them, so it is what it is, I suppose.